Pin 4 and Pin 5 on the J3 header (the RS-485 port) were swapped between revisions. Do not connect a V01 cable to a V02 board without verifying the pinout, as this will short the +5V rail.
A less common but documented use is within older X-ray or MRI room power distribution panels. The board manages the sequence of contactors that power up the high-voltage generator. In this role, the V02 revision fixed a latch-up issue in the voltage regulator that previously caused spurious shutdowns. Pcb05-436-v02
And somewhere, deep in the copper veins of the board, the lavender bloomed. Pin 4 and Pin 5 on the J3
: It continuously processes data from sensors to manage airflow and protect the unit from fluctuating environmental conditions. Operational Logic The board manages the sequence of contactors that
The most common habitat for the PCB05-436-V02 is inside a Lennox, Carrier, or Trane RTU from the mid-2010s. Here, the board acts as an or a blower sequencer . It reads outdoor air temperature and humidity (via the analog inputs) and drives dampers (via relay outputs) to optimize free cooling.